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It says a significant oil spill at the tanker terminal that would be built in Kitimat, B.C., as part of the project is possible once every 15 to 41 years, compared to the company estimate of once every 62 years.

And there are likely to be 15 to 16 pipeline spills a year on land, compared to Enbridge’s estimate of one every two years, says the study by Gunton, a former deputy minister of environment for a provincial NDP government.

The review panel weighing the pipeline is expected to wrap up the questioning phase of hearings in Prince Rupert this week, and final arguments will begin in Terrace in June.